Yup, it's unrealistic to have every naval vessel in a mission running around all over the place, pinging the whole time.
It's an easy fix, however. When scripting a mission, you must select the EMCON (or Emission Control) option, which means that particular ship won't use any of it's active sensors (active sonar, radar, etc) unless it is attacked, or a ship in it's group is attacked.
Cheers
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